CHAPTER 6 Startup and Shutdown
|0||PROM monitor level (power-down)||init 0, shutdown -i0, halt|
|1,S,s||Single-user mode||init 1, shutdown -i1|
|2||Multi-user mode, NO resources shared||init 2, shutdown -i2|
|3||Multi-user mode, resources shared||init 3, shutdown -i3|
|4||Alternative multi-user mode (not currently used)|
|5||Halt and software Poweroff the system||init 5, shutdown -i5|
|6||Halt and reboot to default state||init 6, shutdown -i6, reboot|
You can determine the current run state with the command
# who -r
. run-level 3 Feb 22 08:54 3 0 S
Additionally, init responds to the q or Q run levels, which cause init to reread /etc/inittab.
Digital UNIX has run levels 0,2,3,q,s.